Explosion-guard.



F. 0. HOAGLAND.

EXPLOSION GUARD.

APPLIOATION FILED APR. 28, 1913.

1,086,708. Patented Feb. 10, 1914.

B]? 25 F/ j IN VENTOR izwafia m fizz/Tm BY ATTORNEY COLUMBIA PLANOGRAPH 50.. WASHINGTON, D. c.

stored or used, as 1n powder magazines,

STATES PATEN FRANK O. HOAGLAND, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE UNION METALLIC CARTRIDGE COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORA- TION OF CONNECTICUT.

.ment in Explosion-Guards, .(Case 13,) of

which the following is a specification.

This invention has for its general object,

to providean explosion guard adapted for use wherever gun powder of any kind is cartridge loading machines, etc.

It is a well known fact that if the gases of an explosion are not confined, very much less damage is done.

My present invention, therefore, has for its object specifically to provide an explosion guard which shall afford effective protection for operatives upon cartridge load ing machines and for persons whose duties require them to be near powder magazines by providing a fixed guard and a vertically movable guard surrounding the powder and so constructed as not to confine the explosion but to check it and to prevent the passage of powder dust. This I accomplish by the use of perforate fixed and movable guards, which I-will now describe.

. In the accompanying drawingforming a part of this specification, Figure 1 is an elevation partly in section and partly broken away to illustrate the construction of my novel guards, themovable guard being shown ass'lightly raised, and the invention shown" as applied to a powder hopper; Fig. 2 a detail view illustrating a special weave of heavywire netting which may be used for the outer ply of the guards to give the required strength and resilience,- and Figs. 3 and 41 are cross sections on a reduced scale of different forms of movable guards.

It is deemed sufficient for the purposes of this specification to illustrate and describe the invention as applied to a powderhopper.

11) denotes a hopper which may be of any ordinary or preferred construction and is shown as provided with a delivery tube 11, a gate 12, a horizontal flange 13 upon which the guards rest, and a vertical flange 1 1 to which the fixed guard is secured.

15 denotes the fixed guard as a whole and.

16 the vertically movable guard as a whole, which incloses the fixed guard and extends above it. The body of, both the fixed and Specification of Letters Patent.

EXPLOSION-GUARD.

Patented Feb. 10, 1914..

Application filed April 28, 1913. Serial No. 764,050.

movable guards consists of a plurality of plies of ordinary wire netting, such as is used for house-screens and which I haveindicated by 17, or equivalent material as expanded metal or steel wool. .This body may be formed by taking a'strip of wire netting and winding it closely in layers until the desired thickness is obtained. I use in pract1ce several dozen plies of the wire netting in these guards, any special number of plies or thickness of the guards not being of the essence of the invention. It is likewise immaterial what special form is given to the guards in cross section. They may be square as in Fig. 3, or round as in Fig. 4. If made square or of any angular form there is an additional yielding resistance to the force of an explosion which will tend to spring the movable guard to a circular form. Inside and outside of the layers of Wire netting in both. of the guards, I place a ply of fine textile material indicated by 18. In practice I have used a silk fabric for this purpose on account of the fineness of its weave, which still leaves it pervious. The object of these plies of textile material is to prevent the meshes of the wire netting from becoming clogged with powder dust. Upon the inner side of each guard I place a ply of relatively heavy wire netting indicated by 19. It is desirable for these inner plies to provide a wire heavy enoughto resist the intense heat of an explosion without melting. As already 'explained the outer or movable guard is adapted to move freely over the fixed guard. In order to prevent the frictional contact of wire netting and leave the outer. guard free to move without serious frictional resistance, I place upon the outer side of the fixed guard a covering strip of relatively light, closely perforated sheet metal which I have indicated by 20 and which I have shown as curved over the top of the fixed guard to provide a finish, although this is immaterial. The fixed guard is secured to vertical flange 14 in any suitable manner, as by screws 21. Within the fixed guard is a sheet metal strip 22 providedwith a flange 23 by means of which it is secured to flange 14. The purpose of, this strip is to prevent the first and direct force of the explosion from being expended directly upon the wire netting of the fixed guard by providing a non-rigidbnt impervious surface to receive the first force of the explosion and deflect it upward, the gases passingthrough the netting above the strip. The resilience of this strip permits it to yield somewhat to the explosion and prevents it from being torn or shattered. Outside of the movable guard-'1 place a ply of heavy coarse wire netting indicated by 24:. The purpose of this ply ofhe'a'vy wire netting is to give great strength to the movable guard to* prevent its being ruptured, but without interfering to any appreciable extent' witlithepassage of the ases of an explosion; In' practice," especial y if round guards areused, I havef'ound it' desirable to use for this outer plya netting'in which the transverse strands of wire (which lie vertically in theguardy are" straight and the longitudinal strands only are bent, as

shown in Fig: 2. This form of netting, I- have found; yields without breaking under the stress of an explosion: I also preferably provide the movable guard with bands 25 of heavy wire,-t'wo being shown in the present instance:

ln order topermit themov-able guard to be raised and lowered easily when it is required tofill the hopper, I have shown a bail 26"as attached to the'upper band, a rope 27 as attached to the bail and passing over pulleys 28and aweight 29 atthe other end of the r'op'e to serve as a counterbalance. 30 denotes handles which may be provided on the-movable guard for convenience in raising and loweringit- At the lower'edge of the movable'guard I place a U-s'hapedsheet' metal strip 31 which serves as a finish for the edge thereof and which normally rests upon horizontal flange 18- in use. This strip contacts loosely with the coveringstrip of the fixed guard and permits'free movement of the movable guard by providing-a smooth contact surface for engagement with the covering strip and by keeping the inner ply of netting 19 of the movable guard out of contact with the fixed 1- guard;

When anexplosion takes place strip-22 directs tlie force'upward, prevents-jthe fixed guard from" being ruptured and prevents downward leakage of gases betweenthe hopper and the. guard." Above this strip, the gases of the" explosion will pass freely through both guards. The relatively coarse wires of innerply 19 of both guards are large'enoughnot to be melted by the intense heat of the explosion and thus prevent the destruction ofthe guards; The'function of the fixed guard" is to check the gases of the explosion" and: deflect them upward, at the sa'me'timepermitting the passage ofa portion of the gases. A vitally important feat'ure'of the invention, however, is the outer movable guard which checks but permitsthe passage of gasesand is free t'o belifted'upi,osc,708

ward by the force of the explosion, thus preventing the lateral escape of the great'volume of the gases which-has heretofore been the great source of 'dangerr Having thus described my invention, I claim:

l. A structure of the character described comprising a fixed guard made of pervious material and a pervious movable guard injc'losing the fixed guard, both guards acting to check the force of an explosion and the 'movable' guard being lifted thereby.

'2. A structure of the character-described comprising a fixed guard consisting: of a plurality of plies of wire netting and -a'movableguard inclosing' the fixed guard and likewise consisting of a plurality'of plies' of .wire netting;

I 3. A: structure'of the" character described comprisinga fixed guard consisting 'of'a-plurality of plies of wire netting and a movable guard inclosing'the fixed guardand likewise consisting 'of a plurality-0f plies of wirenetting, the fixed guard having an outer closely perforated covering strip of :Jsheet' metal and the" movable guard having at its lower edge' a U shaped sheet metal finishing strip which contacts loosely with the covering strip and permits free move- ;ment of the movable'guardi- 4 In a structure of the character described the combination" with" a fixed guard consistofa plurality of plies of wire netting, "of amovable'guard inclosing'the fixed guard and extending above it and likewise conisisting-of a p'lurality of plies of wire netting; 5.-In a structure'of thecharacter described I the combination with a. fixed guard consist iingof a plurality of plies of' wire netting, j of a movable guard-"inclosing the'fixed'gu'a'rd and extending above it andlikewise' consist 1; ing of a plurality of plies of wire'netting; ;;both' of said guardshavinginner plies of 'f relatively heavy netting,*for the purpose set forth.

6. In a structure of the character described ;the combination with afixed uard consistiiing'of a" plurality of plies of wire netting, of a'movable' guard inclosingi the" fixed guard and extending above it and likewise consistiing' of a plurality of plies'of wire netting, fboth of said guards being provided with jplies of finely woven textile material to stop ithe passage of powder dust.

E 7. In a structure of the character described the combination with a fixed guard consist- ;ing'of-a plurality'of plies of wire netting, iof a movable guard inclosing the fixed guard land extending aboveit and likewise consist- ;ing of a plurality of plies of wire netting, Esaid guards having inner plies of relatively iheavy wire netting, the fixed guard having closely perforated sheet metal covering @st-rip and the movable guard having a"U-' shaped finishing strip loosely engaging the ply of coarse wire netting.

the fixed guard being provided with a defleeting strip to direct the force of an ex- 10 plosion upward, and prevent downward leakage of gases. 7

In testimony whereof I aflix my signature in presence of two witnesses.

FRANK O. HOAGLAND. Witnesses:

A. M. Woosrnn, S. W. ATHERTON.

covering strip and an outer strengthening 8. In a structure of the character described the combination with a fixed guard consisting of a plurality of plies of wire netting, of a movable guard inclosing the fixed guard and extending above it and likewise consisting of a plurality of plies of wire netting,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

Washington, D. G. V 

